President Trump decertified the internationally-supported Iran nuclear deal Friday but didn't walk away from it. Instead, he kicked it to Congress to determine whether to reimpose sanctions even though the International Atomic Energy Agency has verified Iran was in compliance with the deal.

The ramifications of unilaterally breaking the deal could further hurt American credibility globally, escalate tensions in the Middle East and widen our gulf with North Korea. The president's action becomes more disturbing in light of his prior withdrawal from the Paris Climate Accord and the Trans-Pacific Partnership.

Also this hour: New York professor David Carroll is using​ British law to ​get his personal data from Cambridge Analytica, the London-based data company at the heart of the 2016 Trump campaign.​ He wants to know how his data was used to profile and target him during the 2016 election.​ So does special prosecutor Robert Mueller yet, unlike in the U.K. Americans have few rights to their data.

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President Trump is striking a formal blow against the Iran nuclear deal. But he is stopping short of asking Congress to reimpose sanctions on Tehran. Instead, the president is urging lawmakers to pass a new law, spelling out conditions under which sanctions could be reimposed.

Update at 6:30 a.m. Wednesday: Iranian cancer researcher Dr. Sayed Mohsen Dehnavi and his family were put on a flight back to Iran Tuesday night, per U.S. Customs and Border Protection and Boston Children’s Hospital.

Original story:

An Iranian researcher coming to work at Boston Children’s Hospital as a visiting scholar has been denied entry to the United States.